[ 41.562802] audit: type=1800 audit(1550813905.230:30): pid=7871 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 45.653161] kauditd_printk_skb: 4 callbacks suppressed [ 45.653177] audit: type=1400 audit(1550813909.340:35): avc: denied { map } for pid=8046 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.195' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program [ 1123.061231] audit: type=1400 audit(1550814986.750:36): avc: denied { map } for pid=8058 comm="syz-executor004" path="/root/syz-executor004991115" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 1123.141629] hrtimer: interrupt took 42841 ns [ 1228.309599] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1228.315898] rcu: (detected by 1, t=10502 jiffies, g=5873, q=2) [ 1228.321984] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295059997-4295049495), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 1228.334640] syz-executor004 R running task 26448 8069 8060 0x00000000 [ 1228.341901] Call Trace: [ 1228.344488] [ 1228.346734] sched_show_task.cold+0x292/0x30b [ 1228.351270] ? set_rq_offline.part.0+0x140/0x140 [ 1228.356065] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 1228.361089] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1228.366689] rcu_check_callbacks.cold+0xa10/0xa4a [ 1228.371582] update_process_times+0x32/0x80 [ 1228.376429] tick_sched_handle+0xa2/0x190 [ 1228.380602] tick_sched_timer+0x47/0x130 [ 1228.384673] __hrtimer_run_queues+0x33e/0xde0 [ 1228.389177] ? tick_sched_do_timer+0x1b0/0x1b0 [ 1228.393768] ? hrtimer_start_range_ns+0xc80/0xc80 [ 1228.398615] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 1228.403638] ? ktime_get_update_offsets_now+0x2d9/0x440 [ 1228.409017] hrtimer_interrupt+0x314/0x770 [ 1228.413361] smp_apic_timer_interrupt+0x120/0x570 [ 1228.418216] apic_timer_interrupt+0xf/0x20 [ 1228.422446] [ 1228.424693] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 [ 1228.430061] Code: e5 08 41 bc f4 ff ff ff e8 11 9f ea ff 48 c7 05 12 fb e5 08 00 00 00 00 e9 c8 e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 38 0c [ 1228.448971] RSP: 0018:ffff888084ed72c0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 1228.456693] RAX: dffffc0000000000 RBX: ffff88809a2205c0 RCX: ffffffff81e7c36c [ 1228.463965] RDX: 1ffff11013444114 RSI: ffffffff81e7c37a RDI: ffff88809a2208a0 [ 1228.471243] RBP: ffff888084ed7300 R08: ffff88808fa28240 R09: ffffed1015d25bd0 [ 1228.478516] R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: 0000000000000002 [ 1228.485786] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 1228.493140] ? __ext4_journal_start_sb+0x9c/0x4a0 [ 1228.497999] ? __ext4_journal_start_sb+0xaa/0x4a0 [ 1228.502847] ? __ext4_journal_start_sb+0x28d/0x4a0 [ 1228.507817] ? ext4_dirty_inode+0x64/0xc0 [ 1228.511973] ? ext4_setattr+0x2350/0x2350 [ 1228.516133] ext4_dirty_inode+0x64/0xc0 [ 1228.520113] ? ext4_setattr+0x2350/0x2350 [ 1228.524308] __mark_inode_dirty+0x919/0x1290 [ 1228.528728] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1228.534313] __generic_write_end+0x1b9/0x240 [ 1228.538737] generic_write_end+0x6c/0x90 [ 1228.542807] ext4_da_write_end+0x3c8/0xa50 [ 1228.547050] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1228.552654] generic_perform_write+0x2f0/0x530 [ 1228.557251] ? page_endio+0x780/0x780 [ 1228.561108] ? current_time+0x140/0x140 [ 1228.565095] ? generic_write_check_limits+0x2a0/0x2a0 [ 1228.570318] ? lock_acquire+0x16f/0x3f0 [ 1228.574305] ? ext4_file_write_iter+0x250/0x1160 [ 1228.579075] __generic_file_write_iter+0x25e/0x630 [ 1228.584025] ext4_file_write_iter+0x33f/0x1160 [ 1228.588650] ? ext4_file_mmap+0x410/0x410 [ 1228.592799] ? __lock_is_held+0xb6/0x140 [ 1228.596878] ? ___might_sleep+0x163/0x280 [ 1228.601035] ? __might_sleep+0x95/0x190 [ 1228.605063] do_iter_readv_writev+0x5e0/0x8e0 [ 1228.609571] ? vfs_dedupe_file_range+0x780/0x780 [ 1228.614342] ? rw_verify_area+0x118/0x360 [ 1228.618504] do_iter_write+0x184/0x610 [ 1228.622404] ? rcu_read_lock_sched_held+0x110/0x130 [ 1228.627488] ? __kmalloc+0x5d5/0x740 [ 1228.631214] vfs_iter_write+0x77/0xb0 [ 1228.635026] iter_file_splice_write+0x667/0xbe0 [ 1228.639716] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 1228.645021] ? rw_verify_area+0x118/0x360 [ 1228.649173] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 1228.654467] direct_splice_actor+0x126/0x1a0 [ 1228.658891] splice_direct_to_actor+0x369/0x970 [ 1228.663571] ? generic_pipe_buf_nosteal+0x10/0x10 [ 1228.668424] ? do_splice_to+0x190/0x190 [ 1228.672416] ? rw_verify_area+0x118/0x360 [ 1228.676571] do_splice_direct+0x1da/0x2a0 [ 1228.680730] ? splice_direct_to_actor+0x970/0x970 [ 1228.685584] ? rcu_read_lock_sched_held+0x110/0x130 [ 1228.690603] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 1228.695363] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1228.700907] ? __sb_start_write+0x1ac/0x360 [ 1228.705235] do_sendfile+0x597/0xd00 [ 1228.708963] ? do_compat_pwritev64+0x1c0/0x1c0 [ 1228.713562] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1228.719190] ? _copy_from_user+0xdd/0x150 [ 1228.723355] __x64_sys_sendfile64+0x15a/0x220 [ 1228.727856] ? __ia32_sys_sendfile+0x230/0x230 [ 1228.732480] ? do_syscall_64+0x26/0x610 [ 1228.736470] ? lockdep_hardirqs_on+0x415/0x5d0 [ 1228.741097] ? trace_hardirqs_on+0x67/0x230 [ 1228.745435] do_syscall_64+0x103/0x610 [ 1228.749346] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1228.754536] RIP: 0033:0x446a59 [ 1228.757738] Code: e8 dc e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 4b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1228.776644] RSP: 002b:00007fce454e5db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 1228.784359] RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446a59 [ 1228.791632] RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 1228.799168] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 1228.806441] R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000006dcc2c [ 1228.813725] R13: 00007ffd7bf04daf R14: 00007fce454e69c0 R15: 20c49ba5e353f7cf [ 1228.821024] rcu: rcu_preempt kthread starved for 10502 jiffies! g5873 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 1228.831415] rcu: RCU grace-period kthread stack dump: [ 1228.836598] rcu_preempt R running task 29200 10 2 0x80000000 [ 1228.843800] Call Trace: [ 1228.846402] __schedule+0x817/0x1cc0 [ 1228.850133] ? pci_mmcfg_check_reserved+0x170/0x170 [ 1228.855154] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 1228.860268] ? lockdep_hardirqs_on+0x415/0x5d0 [ 1228.864861] ? trace_hardirqs_on+0x67/0x230 [ 1228.869195] schedule+0x92/0x180 [ 1228.872578] schedule_timeout+0x4db/0xfd0 [ 1228.876736] ? usleep_range+0x170/0x170 [ 1228.880713] ? trace_hardirqs_on+0x67/0x230 [ 1228.885040] ? kasan_check_read+0x11/0x20 [ 1228.889196] ? __next_timer_interrupt+0x1a0/0x1a0 [ 1228.894102] ? prepare_to_swait_exclusive+0x120/0x120 [ 1228.899307] rcu_gp_kthread+0x956/0x17a0 [ 1228.903371] ? kasan_check_read+0x11/0x20 [ 1228.907533] ? rcu_exp_wait_wake+0x3c0/0x3c0 [ 1228.911949] ? trace_hardirqs_on+0x67/0x230 [ 1228.916280] ? kasan_check_read+0x11/0x20 [ 1228.920437] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 1228.925551] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 1228.931124] ? __kthread_parkme+0xfb/0x1b0 [ 1228.935367] kthread+0x357/0x430 [ 1228.938736] ? rcu_exp_wait_wake+0x3c0/0x3c0 [ 1228.943151] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 1228.948695] ret_from_fork+0x3a/0x50